Exhaust gas recirculation system for a V-type engine

Claim 1

In an exhaust gas recirculation system for a V-type engine having a pair of cylinder banks arranged at an angle to each other on opposite sides of a crankshaft, each cylinder bank having a plurality of cylinders therein and an intake passage being separately provided for each cylinder, the improvement which comprises that the intake passages have respective proximate portions at which the intake passages to the cylinders in one cylinder bank and the intake passages to the cylinders in the other cylinder bank are aligned with each other as viewed in the direction of the crankshaft, said proximate portions being in the middle of the engine between the cylinder banks, an exhaust recirculation passage for recirculating exhaust gas from an exhaust passage to the cylinders extending along the proximate portions in the direction of the crankshaft and communicating with each intake passage by way of a communicating aperture, said exhaust recirculation passage extending in the middle of the engine between the cylinder banks in the direction of the crankshaft and having an open end in proximity to the most remote intake passage as viewed in the direction of the crankshaft, an exhaust recirculation valve, for controlling the amount of exhaust gas, in the open end of said exhaust recirculation passage, and a branch exhaust passage, one end of which communicates with the exhaust recirculation passage by way of the exhaust recirculation valve and the other end of which communicates with an exhaust passage of the engine.